diff options
Diffstat (limited to 'quantum/audio/driver_chibios_pwm_software.c')
| -rw-r--r-- | quantum/audio/driver_chibios_pwm_software.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/quantum/audio/driver_chibios_pwm_software.c b/quantum/audio/driver_chibios_pwm_software.c deleted file mode 100644 index 15c3e98b6a..0000000000 --- a/quantum/audio/driver_chibios_pwm_software.c +++ /dev/null @@ -1,164 +0,0 @@ -/* Copyright 2020 Jack Humbert - * Copyright 2020 JohSchneider - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -/* -Audio Driver: PWM - -the duty-cycle is always kept at 50%, and the pwm-period is adjusted to match the frequency of a note to be played back. - -this driver uses the chibios-PWM system to produce a square-wave on any given output pin in software -- a pwm callback is used to set/clear the configured pin. - - */ -#include "audio.h" -#include "ch.h" -#include "hal.h" - -#if !defined(AUDIO_PIN) -# error "Audio feature enabled, but no pin selected - see docs/feature_audio under the ARM PWM settings" -#endif -extern bool playing_note; -extern bool playing_melody; -extern uint8_t note_timbre; - -static void pwm_audio_period_callback(PWMDriver *pwmp); -static void pwm_audio_channel_interrupt_callback(PWMDriver *pwmp); - -static PWMConfig pwmCFG = { - .frequency = 100000, /* PWM clock frequency */ - // CHIBIOS-BUG? can't set the initial period to <2, or the pwm (hard or software) takes ~130ms with .frequency=500000 for a pwmChangePeriod to take effect; with no output=silence in the meantime - .period = 2, /* initial PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */ - .callback = pwm_audio_period_callback, - .channels = - { - // software-PWM just needs another callback on any channel - {PWM_OUTPUT_ACTIVE_HIGH, pwm_audio_channel_interrupt_callback}, /* channel 0 -> TIMx_CH1 */ - {PWM_OUTPUT_DISABLED, NULL}, /* channel 1 -> TIMx_CH2 */ - {PWM_OUTPUT_DISABLED, NULL}, /* channel 2 -> TIMx_CH3 */ - {PWM_OUTPUT_DISABLED, NULL} /* channel 3 -> TIMx_CH4 */ - }, -}; - -static float channel_1_frequency = 0.0f; -void channel_1_set_frequency(float freq) { - channel_1_frequency = freq; - - if (freq <= 0.0) // a pause/rest has freq=0 - return; - - pwmcnt_t period = (pwmCFG.frequency / freq); - pwmChangePeriod(&AUDIO_PWM_DRIVER, period); - - pwmEnableChannel(&AUDIO_PWM_DRIVER, AUDIO_PWM_CHANNEL - 1, - // adjust the duty-cycle so that the output is for 'note_timbre' duration HIGH - PWM_PERCENTAGE_TO_WIDTH(&AUDIO_PWM_DRIVER, (100 - note_timbre) * 100)); -} - -float channel_1_get_frequency(void) { return channel_1_frequency; } - -void channel_1_start(void) { - pwmStop(&AUDIO_PWM_DRIVER); - pwmStart(&AUDIO_PWM_DRIVER, &pwmCFG); - - pwmEnablePeriodicNotification(&AUDIO_PWM_DRIVER); - pwmEnableChannelNotification(&AUDIO_PWM_DRIVER, AUDIO_PWM_CHANNEL - 1); -} - -void channel_1_stop(void) { - pwmStop(&AUDIO_PWM_DRIVER); - - palClearLine(AUDIO_PIN); // leave the line low, after last note was played - -#if defined(AUDIO_PIN_ALT) && defined(AUDIO_PIN_ALT_AS_NEGATIVE) - palClearLine(AUDIO_PIN_ALT); // leave the line low, after last note was played -#endif -} - -// generate a PWM signal on any pin, not necessarily the one connected to the timer -static void pwm_audio_period_callback(PWMDriver *pwmp) { - (void)pwmp; - palClearLine(AUDIO_PIN); - -#if defined(AUDIO_PIN_ALT) && defined(AUDIO_PIN_ALT_AS_NEGATIVE) - palSetLine(AUDIO_PIN_ALT); -#endif -} -static void pwm_audio_channel_interrupt_callback(PWMDriver *pwmp) { - (void)pwmp; - if (channel_1_frequency > 0) { - palSetLine(AUDIO_PIN); // generate a PWM signal on any pin, not necessarily the one connected to the timer -#if defined(AUDIO_PIN_ALT) && defined(AUDIO_PIN_ALT_AS_NEGATIVE) - palClearLine(AUDIO_PIN_ALT); -#endif - } -} - -static void gpt_callback(GPTDriver *gptp); -GPTConfig gptCFG = { - /* a whole note is one beat, which is - per definition in musical_notes.h - set to 64 - the longest note is BREAVE_DOT=128+64=192, the shortest SIXTEENTH=4 - the tempo (which might vary!) is in bpm (beats per minute) - therefore: if the timer ticks away at .frequency = (60*64)Hz, - and the .interval counts from 64 downwards - audio_update_state is - called just often enough to not miss anything - */ - .frequency = 60 * 64, - .callback = gpt_callback, -}; - -void audio_driver_initialize(void) { - pwmStart(&AUDIO_PWM_DRIVER, &pwmCFG); - - palSetLineMode(AUDIO_PIN, PAL_MODE_OUTPUT_PUSHPULL); - palClearLine(AUDIO_PIN); - -#if defined(AUDIO_PIN_ALT) && defined(AUDIO_PIN_ALT_AS_NEGATIVE) - palSetLineMode(AUDIO_PIN_ALT, PAL_MODE_OUTPUT_PUSHPULL); - palClearLine(AUDIO_PIN_ALT); -#endif - - pwmEnablePeriodicNotification(&AUDIO_PWM_DRIVER); // enable pwm callbacks - pwmEnableChannelNotification(&AUDIO_PWM_DRIVER, AUDIO_PWM_CHANNEL - 1); - - gptStart(&AUDIO_STATE_TIMER, &gptCFG); -} - -void audio_driver_start(void) { - channel_1_stop(); - channel_1_start(); - - if (playing_note || playing_melody) { - gptStartContinuous(&AUDIO_STATE_TIMER, 64); - } -} - -void audio_driver_stop(void) { - channel_1_stop(); - gptStopTimer(&AUDIO_STATE_TIMER); -} - -/* a regular timer task, that checks the note to be currently played - * and updates the pwm to output that frequency - */ -static void gpt_callback(GPTDriver *gptp) { - float freq; // TODO: freq_alt - - if (audio_update_state()) { - freq = audio_get_processed_frequency(0); // freq_alt would be index=1 - channel_1_set_frequency(freq); - } -} |